The CSFML library is licensed under the ZLIB license
When redistributing binaries, the zlib requirements are ... minimal. In fact there are no requirements in that case beside not claiming that I wrote this library.
Therefore I do not need to do anything special and in particular I do not need to include the license text in a binary-only redistribution. The zlib license has no such requirement for binaries.
However, the right thing do is to meet also the suggested requirements:
If you use this software in a product, an acknowledgement in the product documentation would be appreciated but is not required.
Therefore I would include in my product documentation and/or credits page some acknowledgement for that library. Since I want to do the right thing and I may also include several other open source libraries in my product, I would also include the [copyright notice and license text1 for good measure even if this not strictly required here: this way I would just treat this as the other libraries and include all the license and notice texts.